First slide

Variation of g

Question

If g on the surface of the earth is 9.8 m/s² , its value at a height of 6400 km is (Radius of the earth = 6400km).

Moderate

A

4.9ms^–2
B

9.8ms^–2
C

2.45ms^–2
D

19.6ms^–2

Solution

$\frac{g_{h}}{g} = \frac{R^{2}}{(R + h)^{2}}$

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